20072180 has 12 divisors (see below), whose sum is σ = 42151620. Its totient is φ = 8028864.

The previous prime is 20072179. The next prime is 20072183. The reversal of 20072180 is 8127002.

It can be written as a sum of positive squares in 2 ways, for example, as 3976036 + 16096144 = 1994^2 + 4012^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1003609 = 20072180 / (2 + 0 + 0 + 7 + 2 + 1 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20072183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501785 + ... + 501824.

It is an arithmetic number, because the mean of its divisors is an integer number (3512635).

Almost surely, 2^20072180 is an apocalyptic number.

20072180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20072180 is an abundant number, since it is smaller than the sum of its proper divisors (22079440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20072180 is a wasteful number, since it uses less digits than its factorization.

20072180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003618 (or 1003616 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20072180 is about 4480.1986563098. The cubic root of 20072180 is about 271.7679140515.

Adding to 20072180 its reverse (8127002), we get a palindrome (28199182).

The spelling of 20072180 in words is "twenty million, seventy-two thousand, one hundred eighty".